[libcamera-devel] [PATCH v2 11/13] libcamera: Add ControlValidator

[Laurent Pinchart]

The new abstract ControlValidator class defines an interface that will
be used by the ControlList class to validate controls. This will allow
controls to the validated against different object types, such as Camera
and V4L2Device.

Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
 src/libcamera/control_validator.cpp       | 45 +++++++++++++++++++++++
 src/libcamera/include/control_validator.h | 27 ++++++++++++++
 src/libcamera/include/meson.build         |  1 +
 src/libcamera/meson.build                 |  1 +
 4 files changed, 74 insertions(+)
 create mode 100644 src/libcamera/control_validator.cpp
 create mode 100644 src/libcamera/include/control_validator.h

diff --git a/src/libcamera/control_validator.cpp b/src/libcamera/control_validator.cpp
new file mode 100644
index 000000000000..8e5cf3c3e3ee
--- /dev/null
+++ b/src/libcamera/control_validator.cpp
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * control_validator.cpp - Control validator
+ */
+
+#include "control_validator.h"
+
+/**
+ * \file control_validator.h
+ * \brief Abstract control validator
+ */
+
+namespace libcamera {
+
+/**
+ * \class ControlValidator
+ * \brief Interface for the control validator
+ *
+ * The ControlValidator class is used by the ControlList class to validate
+ * controls added to the list. It is an abstract class providing an interface
+ * for object-specific control validation, such a Camera controls and V4L2
+ * controls.
+ */
+
+/**
+ * \fn ControlValidator::name()
+ * \brief Retrieve the name of the object associated with the validator
+ * \return The name of the object associated with the validator
+ */
+
+/**
+ * \fn ControlValidator::validate()
+ * \brief Validate a control
+ * \param[in] id The control ID
+ *
+ * This method validates the control \a id against the object corresponding to
+ * the validator. It shall at least validate that the control is applicable to
+ * the object instance, and may perform additional checks.
+ *
+ * \return True if the control is valid, false otherwise
+ */
+
+} /* namespace libcamera */
diff --git a/src/libcamera/include/control_validator.h b/src/libcamera/include/control_validator.h
new file mode 100644
index 000000000000..3598b18f2f26
--- /dev/null
+++ b/src/libcamera/include/control_validator.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * control_validator.h - Control validator
+ */
+#ifndef __LIBCAMERA_CONTROL_VALIDATOR_H__
+#define __LIBCAMERA_CONTROL_VALIDATOR_H__
+
+#include <string>
+
+namespace libcamera {
+
+class ControlId;
+
+class ControlValidator
+{
+public:
+	virtual ~ControlValidator() {}
+
+	virtual const std::string &name() const = 0;
+	virtual bool validate(const ControlId &id) const = 0;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_CONTROL_VALIDATOR_H__ */
diff --git a/src/libcamera/include/meson.build b/src/libcamera/include/meson.build
index 933be8543a8d..1cf47204f2b5 100644
--- a/src/libcamera/include/meson.build
+++ b/src/libcamera/include/meson.build
@@ -1,5 +1,6 @@
 libcamera_headers = files([
     'camera_sensor.h',
+    'control_validator.h',
     'device_enumerator.h',
     'device_enumerator_sysfs.h',
     'device_enumerator_udev.h',
diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index 6df48365266d..c8a66cfc93d5 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -5,6 +5,7 @@ libcamera_sources = files([
     'camera_manager.cpp',
     'camera_sensor.cpp',
     'controls.cpp',
+    'control_validator.cpp',
     'device_enumerator.cpp',
     'device_enumerator_sysfs.cpp',
     'event_dispatcher.cpp',
-- 
Regards,

Laurent Pinchart